Simple but effective. Cheap, loud. Triggers around 3m indoors. Two greetings: English and Chinese. Uses 3 AAA's. Limited range (1m) outdoors -- may be fooled by sunlight but not sure exactly. This is a simple photocell that triggers when a warm... – translate

Sep 2012by tanomandanga

Easy and cute. -Small -Always works regardless the battery charge -When battery is full the sound/sensor works like a charm, if battery is low then the sensor may capt or not the movement and the sound. -Only only two languages. -Depends... – translate